package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Resource
    private WeChatProperties weChatProperties;
    @Resource
    private UserMapper userMapper;
    /*
    * 微信登录
    * */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //获取openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空则表示用户登录失败，抛出业务异常
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.selectOne(new QueryWrapper<User>().eq("openid", openid));

        //如果是新用户，自动完成注册
        if (user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(new Date())
                    .build();
            userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    /*
    * 调用wx服务接口，获取openid
    * */
    private String getOpenid(String code){
        //调用微信服务接口，获取openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
